Engine for a boat



FIG. 1 is a top front perspective view of an engine for a boat showing our new design;

FIG. 2 is a top rear perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a right side view thereof; and,

FIG. 8 is another top front perspective view of the engine for a boat in FIG. 1.

The broken lines in FIGS. 1 through 7 illustrate portions of the engine for a boat that are not part of the claimed design. 

CLAIM The ornamental design for an engine for a boat, as shown and described. 